At least 800 foreigners are among the nearly 1,500 missing, authorities said on Thursday, a day after a massive wall of mud and rock collapsed into a Himalayan river, sending catastrophic floods through towns and valleys.

"Climate change is generating conditions that can destabilize high-mountain rock and ice," said Simon Cox, chief scientist at the Mountains to Sea Program at Earth Sciences New Zealand.

That in turn makes collapses and cascading hazards of the kind seen this week more frequent, he added.

Nuwakot, Nepal, after flash floods hit the area on Aug. 26, 2026. Photo by AP

Exact cause of disaster still being analyzed